https://www.reuters.com/article/us-portugal-websummit-kaiser/twitter-political-ads-ban-no-sure-fix-to-voter-manipulation-kaiser-idUSKBN1XF29L >Brittany Kaiser, a former Cambridge Analytica director turned witness in a cross-Atlantic data privacy scandal, on Tuesday praised Twitter's move to ban political advertising from its platform but said it was not a "permanent fix".